LF: RE: WSPR-8 Test

[Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>]

Hello Marcus, Stefan,

 

very interesting.

Some WSPR-8 followed by WSPR-2 sequences during daytime would show if the gain is 6dB as one could expect.

 

73, Rik  ON7YD - OR7T

---

Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Markus Vester [markusvester@aol.com]
Verzonden: vrijdag 21 september 2012 2:07
To: rsgb_lf_group@blacksheep.org
Onderwerp: LF: WSPR-8 Test

First decodes using 8-minute WSPR:

 

2012-09-21 00:00	DK7FC	0.137508	+7	0	JN49ik	1	DF6NM	JN59nj	175	91
2012-09-20 23:52	DK7FC	0.137508	+3	0	JN49ik	1	DF6NM	JN59nj	175	91

 

Between 23:36 and 23:43:20, Stefan was transmitting 8-times slow WSPR with low power on 136172 Hz. This was recorded here to an IQ file using SndInput from DL4YHF, and replayed 8x fast during the next 2-minute, slot starting 23:44. In the process the audio was frequency shifted from 670 to 2000 Hz, and added to the normal audio data for WSPR.  Thus with the 4x acceleration, Stefan's transmission appeared 8 instead of 2 Hz above center.

 

This is all still a bit improvised, but the concept seems to work.

 

Best 73,

Markus (DF6NM)